US3136830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing elastic polyurethane
Assignee: Bayer AG
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Filing: 1961-04-05
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Granted: 1964-06-09
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Expires: 1981-04-05
Abstract
No abstract record available.
Inventors
- 👤 Oertel Harald
- 👤 Muller Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:40
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/56; C08G18/08; C08G18/10; C08G18/12; D; D01; D01F; D01F6/00; D01F6/58; D01F6/70; Y; Y10; Y10S; Y10S264/00; Y10S264/77
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS FOR THE PREPARATION OF ELASTOMERIC POLYURETHANE FIBERS WHICH COMPRISES REATING A POLYACETAL HAVING AT LEAST TWO HYDROXYL GROUPS AND A MOLECULAR WEIGHT OF FROM ABOUT 500 TO ABOUT 5000, A MEMBER SELECTED FROM THE GROUP CONSISTING OF WATER, HYDRAZINE AND ORGANIC COMPOUNDS CONTAINING ACTIVE HYDROGEN ATOMS CAPABLE OF REACTING WITH -NCO GROUPS AND HAVING A MOLECULAR WEIGHT LESS THAN ABOUT 400 AND AN EXCESS OF AN ORGANIC POLYISOCYANATE TO FORM AN -NCO TERMINATED INTERMEDIATE IN A FIRST STEP AND SPINNING THE SAID INTERMEDIATE INTO AN ORGANIC POLYAMINE BATH TO FORM A FIBER.
Claim 2
Dependent Claim
94 words
A PROCESS FOR THE PREPARATION OF ELASTOMERIC POLYURETHANE FIBERS WHICH COMPRISES REATING A POLYACETAL HAVING AT LEAST TWO HYDROXYL GROUPS AND A MOLECULAR WEIGHT OF FROM ABOUT 500 TO ABOUT 5000, A MEMBER SELECTED FROM THE GROUP CONSISTING OF WATER, HYDRAZINE AND ORGANIC COMPOUNDS CONTAINING ACTIVE HYDROGEN ATOMS CAPABLE OF REACTING WITH -NCO GROUPS AND HAVING A MOLECULAR WEIGHT LESS THAN ABOUT 400 AND AN EXCESS OF AN ORGANIC POLYISOCYANATE TO FORM AN -NCO TERMINATED INTERMEDIATE IN A FIRST STEP AND SPINNING THE SAID INTERMEDIATE INTO AN ORGANIC POLYAMINE BATH TO FORM A FIBER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |